Signpost to the westernmost point of A Pa Chai (Photo: VNA)

Signpost to Border Marker Zero (Photo: VNA)

Staircases leading to Border Marker Zero (Photo: VNA)

Border Marker Zero is located on Khoan La San peak, at an altitude of 1,864m. This is the westernmost point of the country (Photo: VNA)

Staircases leading to Border Marker Zero  (Photo: VNA)

Tourists visit and pose for photos at Border Marker Zero (Photo: VNA)

Border Marker Zero stands at the point which separates Vietnam, Laos and China (Photo: VNA)